18 May Hence, the development of Gate Turn off Thyristor (GTO) addresses the major problem of the thyristor by ensuring the turn OFF mechanism. Production of GTOs commenced in the mid s. A GTO is a thyristor that can be turned off by applying a current to the gate in the reverse direction to that. The conventional thyristor can only be turned off by effectively reducing the anode current to zero, but the gate turn off thyristor.

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Turn off is accomplished thyrstor a “negative voltage” pulse between the gate and cathode terminals. When this is done, it turns on TR2 in the diagram.

For turn-off, the GTO requires a device that limits the rate of voltage rise, in essence a capacitor. GTO thyristors can be fabricated with a reverse conducting diode in the same package. This page was last edited on 1 Junegt Rather than the gate being used gro turn the thyristor on, within a gate turn-off thyristor, GTO, the gate pulse turns the device off.

Gate turn-off thyristor structure. Thank you for your inquiry and interest in ABB. For other uses of the word, see GTO disambiguation. I need service or support ABB Service. This has the drawback that it renders the junction nearest to the cathode normally referred to as J3 with a low breakdown voltage – typically 40 volts.

ABB’s website uses cookies. Turn on is accomplished by a “positive current” pulse between the gate and cathode terminals.

Gate turn-off thyristor

Talk to us If you need to talk to us about any of our products or services, get in htyristor. If the voltage rises too fast at turn off, not all of the device will turn off and the GTO will fail, often explosively, due to the high voltage and current focused on a small portion of the device.

These high current density areas become hot, and can cause device failure if the current is not extinguished quickly. This extracts current from the base region of TR2.

Typical transition times from on to off state and vice versa are in a range of 10 – 30 microseconds. Like the standard thyristor, the gate turn-off thyristor is a thyristro layer device having three junctions.

Although they are not nearly as well known as thyrkstor more standard forms of thyristor, the gate turn off thyristor, is now widely used as it is able to overcome many of the disadvantages of the traditional thyristor.

Gate turn-off thyristors (GTO)

Resetting the snubber circuit usually places a minimum on time requirement on GTO based circuits. By staying here you are agreeing to our use of cookies. It may be noted however, that the turn off time of a GTO is approximately ten times faster than that of a comparable SCR.

Are you looking for support or purchase information? As the gate-cathode behaves like PN junctionthere will be some relatively small voltage between the terminals.

Gate turn-off thyristor – Wikipedia

When the current filaments are extinguished, the overall current flow stops and the depletion layers around the junctions grow – the gate turn-off thyristor enters its forward blocking state again. Please select a language below. Learn more I agree. Production of GTOs commenced in the mid s. They typically have a reverse breakdown rating in the tens of volts. This is to provide good emitter efficiency for which the doping level should thyridtor low, while providing a thtristor turn off characteristic for which a high doping level is needed.

Substantial snubber circuits are added around the device to limit the rise of voltage at turn off. Select the products you are interested in by ticking the related checkbox. Login to myABB There was a problem with your request. Contact information What would you like to do?

Power management RF technology Test Wireless. Current would only flow if the voltage exceeded the breakdown voltage and current would flow as a result of avalanche action, but this mode would not be wanted for normal operation.